As folks have said above, try clearing cache.
Here's some steps found on a website, it's for a phone but should be same on a tablet.
How to fix Zoom not working
Zoom might be the most popular video conferencing app out there. But like any other app/platform, it’s far from being perfect. Your Zoom app may malfunction at the most unrealistic time, but you can fix it easily in most cases.
In addition to the several popular Zoom problems addressed above, here are other tips you can try when Zoom is not working on your device.
- Restart your phone
If it’s just a temporary system glitch, then restarting your phone should be the easiest way to fix it. Just hold down your phone’s power button for about
10 seconds. That should restart your phone. Otherwise, do it the normal way.
- Erase Zoom app’s cache and data
Next, the stored cache and data of the Zoom app may hinder it from working smoothly in some cases. To fix that, we recommend you reset the app by clearing its cache and data.
Here’s how to do it on Android:
• Open the app drawer on your phone and locate the
Zoom
• Long-press its icon, then tap
App info (or the ‘
i’ button)
• Tap
Storage (& Cache)
• Click on
Clear cache, then tap
Clear data as well to reset the Zoom app.
Try re-launching Zoom to see if the issue has been fixed.
- Update the app and your phone
Another reliable method to fix app-related issues is by updating the app and your device. Doing so brings to your device and the app the latest improvements, bug fixes, as well as features.
To update Zoom:
• Launch the
Play Store on your phone.
• Search for
Zoom and click the app.
• If you see an
Update button on the page, tap it to get the latest version. Otherwise, there’s no need to update.
To update your device:
• Launch the
Settings app
• Click on
System
• Select
System Update or
Software Update.
• Tap
Check for updates. If an update is available, download it and restart your device.
Updating your phone and the Zoom app may fix the issue sometimes. But if that didn’t work, try another solution below.
- Enable necessary permissions
Another way to fix Zoom not working on your phone is to ensure you enable all required permission. As said earlier, people won’t hear you if you’ve denied Zoom permission to use your phone’s microphone. The same applies to zoom camera not working and others.
Here’s how to grant zoom all necessary permission on Android
• Locate
Zoom in your app drawer.
• Long-press its icon, then tap
App info (or the ‘
i’ button)
• Tap
Permissions
• Finally, ensure all necessary permissions are turned on.
- Reinstall Zoom
If nothing works, you may need to start afresh by reinstalling Zoom on your phone. By doing that, your device may rectify the issue you’re battling with on Zoom.
• Visit the
Play Store and search for
• Tap the app on the list and hit the
Uninstall ‘
• Wait for a few seconds, then tap the
Install button to download the app again.